1 ;;;; the definitions of VOPs used for non-local exit (THROW, lexical
4 ;;;; This software is part of the SBCL system. See the README file for
7 ;;;; This software is derived from the CMU CL system, which was
8 ;;;; written at Carnegie Mellon University and released into the
9 ;;;; public domain. The software is in the public domain and is
10 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
11 ;;;; files for more information.
15 ;;; Make an environment-live stack TN for saving the SP for NLX entry.
16 (!def-vm-support-routine make-nlx-sp-tn (env)
18 (make-representation-tn *fixnum-primitive-type* immediate-arg-scn)
21 ;;; Make a TN for the argument count passing location for a
23 (!def-vm-support-routine make-nlx-entry-arg-start-location ()
24 (make-wired-tn *fixnum-primitive-type* immediate-arg-scn ocfp-offset))
27 ;;;; save and restoring the dynamic environment
29 ;;;; These VOPs are used in the reentered function to restore the
30 ;;;; appropriate dynamic environment. Currently we only save the
31 ;;;; CURRENT-CATCH and binding stack pointer. We don't need to
32 ;;;; save/restore the current UNWIND-PROTECT, since UNWIND-PROTECTS
33 ;;;; are implicitly processed during unwinding. If there were any
34 ;;;; additional stacks (as e.g. there was an interpreter "eval stack"
35 ;;;; before sbcl-0.7.0), then this would be the place to restore the
38 ;;; Return a list of TNs that can be used to snapshot the dynamic
39 ;;; state for use with the SAVE- and RESTORE-DYNAMIC-ENVIRONMENT VOPs.
40 (!def-vm-support-routine make-dynamic-state-tns ()
41 (list (make-normal-tn *backend-t-primitive-type*)
42 (make-normal-tn *backend-t-primitive-type*)
43 (make-normal-tn *backend-t-primitive-type*)
44 (make-normal-tn *backend-t-primitive-type*)))
46 (define-vop (save-dynamic-state)
47 (:results (catch :scs (descriptor-reg))
48 (nfp :scs (descriptor-reg))
49 (nsp :scs (descriptor-reg))
50 (eval :scs (descriptor-reg)))
53 (load-symbol-value catch *current-catch-block*)
54 (let ((cur-nfp (current-nfp-tn vop)))
56 (inst mskll cur-nfp 4 nfp)))
57 (inst mskll nsp-tn 4 nsp)))
59 (define-vop (restore-dynamic-state)
60 (:args (catch :scs (descriptor-reg))
61 (nfp :scs (descriptor-reg))
62 (nsp :scs (descriptor-reg))
63 (eval :scs (descriptor-reg)))
65 (:temporary (:sc any-reg) temp)
67 (store-symbol-value catch *current-catch-block*)
68 (inst mskll nsp-tn 0 temp)
69 (let ((cur-nfp (current-nfp-tn vop)))
71 (inst bis nfp temp cur-nfp)))
72 (inst bis nsp temp nsp-tn)))
74 (define-vop (current-stack-pointer)
75 (:results (res :scs (any-reg descriptor-reg)))
79 (define-vop (current-binding-pointer)
80 (:results (res :scs (any-reg descriptor-reg)))
84 ;;;; unwind block hackery
86 ;;; Compute the address of the catch block from its TN, then store
87 ;;; into the block the current Fp, Env, Unwind-Protect, and the entry PC.
88 (define-vop (make-unwind-block)
91 (:results (block :scs (any-reg)))
92 (:temporary (:scs (descriptor-reg)) temp)
93 (:temporary (:scs (non-descriptor-reg)) ndescr)
95 (inst lda block (* (tn-offset tn) sb!vm:n-word-bytes) cfp-tn)
96 (load-symbol-value temp *current-unwind-protect-block*)
97 (storew temp block sb!vm:unwind-block-current-uwp-slot)
98 (storew cfp-tn block sb!vm:unwind-block-current-cont-slot)
99 (storew code-tn block sb!vm:unwind-block-current-code-slot)
100 (inst compute-lra-from-code temp code-tn entry-label ndescr)
101 (storew temp block sb!vm:catch-block-entry-pc-slot)))
104 ;;; This is like Make-Unwind-Block, except that we also store in the
105 ;;; specified tag, and link the block into the Current-Catch list.
106 (define-vop (make-catch-block)
108 (tag :scs (any-reg descriptor-reg)))
110 (:results (block :scs (any-reg)))
111 (:temporary (:scs (descriptor-reg)) temp)
112 (:temporary (:scs (descriptor-reg) :target block :to (:result 0)) result)
113 (:temporary (:scs (non-descriptor-reg)) ndescr)
115 (inst lda result (* (tn-offset tn) sb!vm:n-word-bytes) cfp-tn)
116 (load-symbol-value temp *current-unwind-protect-block*)
117 (storew temp result sb!vm:catch-block-current-uwp-slot)
118 (storew cfp-tn result sb!vm:catch-block-current-cont-slot)
119 (storew code-tn result sb!vm:catch-block-current-code-slot)
120 (inst compute-lra-from-code temp code-tn entry-label ndescr)
121 (storew temp result sb!vm:catch-block-entry-pc-slot)
123 (storew tag result sb!vm:catch-block-tag-slot)
124 (load-symbol-value temp *current-catch-block*)
125 (storew temp result sb!vm:catch-block-previous-catch-slot)
126 (store-symbol-value result *current-catch-block*)
128 (move result block)))
130 ;;; Just set the current unwind-protect to TN's address. This
131 ;;; instantiates an unwind block as an unwind-protect.
132 (define-vop (set-unwind-protect)
134 (:temporary (:scs (descriptor-reg)) new-uwp)
136 (inst lda new-uwp (* (tn-offset tn) sb!vm:n-word-bytes) cfp-tn)
137 (store-symbol-value new-uwp *current-unwind-protect-block*)))
139 (define-vop (unlink-catch-block)
140 (:temporary (:scs (any-reg)) block)
142 (:translate %catch-breakup)
144 (load-symbol-value block *current-catch-block*)
145 (loadw block block sb!vm:catch-block-previous-catch-slot)
146 (store-symbol-value block *current-catch-block*)))
148 (define-vop (unlink-unwind-protect)
149 (:temporary (:scs (any-reg)) block)
151 (:translate %unwind-protect-breakup)
153 (load-symbol-value block *current-unwind-protect-block*)
154 (loadw block block sb!vm:unwind-block-current-uwp-slot)
155 (store-symbol-value block *current-unwind-protect-block*)))
159 (define-vop (nlx-entry)
160 (:args (sp) ; Note: we can't list an sc-restriction, 'cause any load vops
161 ; would be inserted before the LRA.
164 (:results (values :more t))
165 (:temporary (:scs (descriptor-reg)) move-temp)
166 (:temporary (:sc non-descriptor-reg) temp)
168 (:save-p :force-to-stack)
171 (emit-return-pc label)
172 (note-this-location vop :non-local-entry)
173 (cond ((zerop nvals))
175 (let ((no-values (gen-label)))
176 (move null-tn (tn-ref-tn values))
177 (inst beq count no-values)
178 (loadw (tn-ref-tn values) start)
179 (emit-label no-values)))
181 (collect ((defaults))
183 (tn-ref values (tn-ref-across tn-ref)))
185 (let ((default-lab (gen-label))
186 (tn (tn-ref-tn tn-ref)))
187 (defaults (cons default-lab tn))
189 (inst move count temp)
190 (inst lda count (fixnumize -1) count)
191 (inst beq temp default-lab)
193 ((descriptor-reg any-reg)
196 (loadw move-temp start i)
197 (store-stack-tn tn move-temp)))))
199 (let ((defaulting-done (gen-label)))
201 (emit-label defaulting-done)
203 (assemble (*elsewhere*)
204 (dolist (def (defaults))
205 (emit-label (car def))
206 (let ((tn (cdr def)))
208 ((descriptor-reg any-reg)
211 (store-stack-tn tn null-tn)))))
212 (inst br zero-tn defaulting-done))))))
213 (load-stack-tn csp-tn sp)))
215 (define-vop (nlx-entry-multiple)
216 (:args (top :target dst) (start :target src) (count :target num))
217 ;; Again, no SC restrictions for the args, 'cause the loading would
218 ;; happen before the entry label.
220 (:temporary (:scs (any-reg) :from (:argument 0)) dst)
221 (:temporary (:scs (any-reg) :from (:argument 1)) src)
222 (:temporary (:scs (any-reg) :from (:argument 2)) num)
223 (:temporary (:scs (descriptor-reg)) temp)
224 (:results (new-start) (new-count))
225 (:save-p :force-to-stack)
228 (emit-return-pc label)
229 (note-this-location vop :non-local-entry)
230 (let ((loop (gen-label))
234 (load-stack-tn dst top)
238 ;; Establish results.
240 (any-reg (move dst new-start))
241 (control-stack (store-stack-tn new-start dst)))
243 (any-reg (inst move num new-count))
244 (control-stack (store-stack-tn new-count num)))
247 ;; Copy stuff on stack.
250 (inst lda src sb!vm:n-word-bytes src)
252 (inst lda num (fixnumize -1) num)
253 (inst lda dst sb!vm:n-word-bytes dst)
257 (inst move dst csp-tn))))
259 ;;; This VOP is just to force the TNs used in the cleanup onto the stack.
260 (define-vop (uwp-entry)
262 (:save-p :force-to-stack)
263 (:results (block) (start) (count))
264 (:ignore block start count)
267 (emit-return-pc label)
268 (note-this-location vop :non-local-entry)))